Hi, you have kept me entertained all afternoon, a very interesting watch! I am about to construct my first amp from a kit, but I wanted to see what tips I can pick up before I get my iron hot! 73Alex M0KVA
I did one of these using Dave's EFB bias but built my own power supply board. I also rewired for 6gm5 tubes. Got almost 33 watts a channel with 0.86% thd. It's a cool option since those are 35watt output transformers. Expensive tube thow.
I really like your builds but this is second video I've seen where you connect neutral (white or blue wire) to the fuse and called it hot. White or blue is neutral, black or brown is hot. It is a safety concern because what you want is when the fuse blows there is no potential in the chassis that can cause injury. With the fuse in the neutral side there is still hot to ground potential, 120 in North America or 240 in Europe.
+wizardrule81 someone made these 10 years ago, it is an ST70 cabinet copy designed to host ST35 parts. I have tried contacting the guy that made them but don't get a response, I'd love to buy 10 more...
Blueglow Electronics same here, I would like just one, I have the power transformer and the output transformers always thought they were gonna sit and sit, but with seeing that chassis gave me hope.
+Arnold Rimmer well a speaker is an inductive load so the freq response & thd will somewhat depend on the speaker's response curve. That's why I do all test on the non-inductive dummy load resistors, they are flat across the entire audio range
Wow! Nice build... however as the others have commented the incoming neutral wire always goes directly to one of the transformer primary leads and the hot wire goes to the switch then to the fuse and then to the other transformer primary wire. You really should do an addendum to this video and correct these glaring mistakes as some novice may take what you did as "gospel" and wire their unit making it potentially an extreme shock hazard.
Watching this build and then listening to it is like watching magic! Wonderful series of videos.
Beautiful build. Many thanks, Mark. Extremely helpful series of vids. 🔊 🎶👍
Great outcome. Nice sound and a very nice amplifier you have build there. Love your test instruments. Keep up the great work.
Hi, you have kept me entertained all afternoon, a very interesting watch! I am about to construct my first amp from a kit, but I wanted to see what tips I can pick up before I get my iron hot! 73Alex M0KVA
Great video series! I love my vintage ST-35!! Great sound!
I did one of these using Dave's EFB bias but built my own power supply board. I also rewired for 6gm5 tubes. Got almost 33 watts a channel with 0.86% thd. It's a cool option since those are 35watt output transformers. Expensive tube thow.
Pretty sure Black is Always Hot side and White Neutral. Nice build and thanks!!
could not hear any sound you played through the amp, I wonder if youtube muted it?
I really like your builds but this is second video I've seen where you connect neutral (white or blue wire) to the fuse and called it hot. White or blue is neutral, black or brown is hot. It is a safety concern because what you want is when the fuse blows there is no potential in the chassis that can cause injury. With the fuse in the neutral side there is still hot to ground potential, 120 in North America or 240 in Europe.
i realize Im quite randomly asking but does anybody know a good place to watch new tv shows online ?
@Eric Jesse I use Flixzone. Just search on google for it :)
@Solomon Shepard yea, have been using Flixzone for years myself =)
@Solomon Shepard thanks, I signed up and it seems like a nice service =) I appreciate it !!
@Eric Jesse Happy to help :D
7247 tube. Dual dissimilar triode. Closely equal to 12DW7.
Is the the Dynaco 35 integrated amp a great tube amp.
Great video, I would like know where that chassis came from, I have seen direct replacements not anything like that one.
+wizardrule81 someone made these 10 years ago, it is an ST70 cabinet copy designed to host ST35 parts. I have tried contacting the guy that made them but don't get a response, I'd love to buy 10 more...
Blueglow Electronics same here, I would like just one, I have the power transformer and the output transformers always thought they were gonna sit and sit, but with seeing that chassis gave me hope.
I thought you need a earth ground for the power cord and avoid taking the power cord ground to chassis ground.
I like your video, very informative, thanks
Oh you with your fancy main grommet pliers lmao
Should be fuse first, then switch.
Merry Christmas
Nice!! (watched the series again....LOL)
When you switch between the dummy load and the speaker. What effect does it have on frequency response and THD?
+Arnold Rimmer well a speaker is an inductive load so the freq response & thd will somewhat depend on the speaker's response curve. That's why I do all test on the non-inductive dummy load resistors, they are flat across the entire audio range
Is a 7247 equivalent to an American tube
I love that nirvana song, and that unplugged album is their best work. maybe play some junior kimbrough on the next one!!!!
Wow! Nice build... however as the others have commented the incoming neutral wire always goes directly to one of the transformer primary leads and the hot wire goes to the switch then to the fuse and then to the other transformer primary wire. You really should do an addendum to this video and correct these glaring mistakes as some novice may take what you did as "gospel" and wire their unit making it potentially an extreme shock hazard.
stand high watt resisters off the board looks are not everything long life is all was cool stay cool
Too bad your video got flagged because of tha nirvana song... Maybe use some public domain song from now on...
Yeah, I have switched to using songs from my own record label due to this.mark
That amp is too nice to play nirvana. Think Katie Melua for example.
Blueglow Electronics I love your Videos! But where I can find part 3? Can you reupload it please? You make a great work with your channel!
Brown = Black = Hot leg. Blue = White = Neutral. Please fix your videos,